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crypto: lib/sha256 - Use generic code from sha256_base

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Instead of duplicating the sha256 block processing code, reuse
the common code from crypto/sha256_base.h.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-05-11 12:30:29 +08:00
parent 70d391a863
commit 6c19f3bfff
2 changed files with 55 additions and 68 deletions
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50
include/crypto/sha256_base.h
View File

@ -8,13 +8,12 @@
#ifndef _CRYPTO_SHA256_BASE_H
#define _CRYPTO_SHA256_BASE_H
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
#include <crypto/sha2.h>
#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/unaligned.h>
#include <linux/types.h>
typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,
int blocks);
@ -35,12 +34,11 @@ static inline int sha256_base_init(struct shash_desc *desc)
return 0;
}
static inline int sha256_base_do_update(struct shash_desc *desc,
const u8 *data,
unsigned int len,
sha256_block_fn *block_fn)
static inline int lib_sha256_base_do_update(struct sha256_state *sctx,
const u8 *data,
unsigned int len,
sha256_block_fn *block_fn)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
sctx->count += len;
@ -73,11 +71,20 @@ static inline int sha256_base_do_update(struct shash_desc *desc,
return 0;
}
static inline int sha256_base_do_finalize(struct shash_desc *desc,
sha256_block_fn *block_fn)
static inline int sha256_base_do_update(struct shash_desc *desc,
const u8 *data,
unsigned int len,
sha256_block_fn *block_fn)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
return lib_sha256_base_do_update(sctx, data, len, block_fn);
}
static inline int lib_sha256_base_do_finalize(struct sha256_state *sctx,
sha256_block_fn *block_fn)
{
const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
struct sha256_state *sctx = shash_desc_ctx(desc);
__be64 *bits = (__be64 *)(sctx->buf + bit_offset);
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
@ -96,10 +103,17 @@ static inline int sha256_base_do_finalize(struct shash_desc *desc,
return 0;
}
static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
static inline int sha256_base_do_finalize(struct shash_desc *desc,
sha256_block_fn *block_fn)
{
unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
struct sha256_state *sctx = shash_desc_ctx(desc);
return lib_sha256_base_do_finalize(sctx, block_fn);
}
static inline int lib_sha256_base_finish(struct sha256_state *sctx, u8 *out,
unsigned int digest_size)
{
__be32 *digest = (__be32 *)out;
int i;
@ -110,4 +124,12 @@ static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
return 0;
}
static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
{
unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
struct sha256_state *sctx = shash_desc_ctx(desc);
return lib_sha256_base_finish(sctx, out, digest_size);
}
#endif /* _CRYPTO_SHA256_BASE_H */

73
lib/crypto/sha256.c
View File

@ -11,12 +11,11 @@
* Copyright (c) 2014 Red Hat Inc.
*/
#include <linux/bitops.h>
#include <linux/export.h>
#include <asm/unaligned.h>
#include <crypto/sha256_base.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <crypto/sha2.h>
#include <asm/unaligned.h>
static const u32 SHA256_K[] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
@ -119,74 +118,40 @@ static void sha256_transform(u32 *state, const u8 *input, u32 *W)
state[4] += e; state[5] += f; state[6] += g; state[7] += h;
}
void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
static void sha256_transform_blocks(struct sha256_state *sctx,
const u8 *input, int blocks)
{
unsigned int partial, done;
const u8 *src;
u32 W[64];
partial = sctx->count & 0x3f;
sctx->count += len;
done = 0;
src = data;
do {
sha256_transform(sctx->state, input, W);
input += SHA256_BLOCK_SIZE;
} while (--blocks);
if ((partial + len) > 63) {
if (partial) {
done = -partial;
memcpy(sctx->buf + partial, data, done + 64);
src = sctx->buf;
}
memzero_explicit(W, sizeof(W));
}
do {
sha256_transform(sctx->state, src, W);
done += 64;
src = data + done;
} while (done + 63 < len);
memzero_explicit(W, sizeof(W));
partial = 0;
}
memcpy(sctx->buf + partial, src, len - done);
void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
{
lib_sha256_base_do_update(sctx, data, len, sha256_transform_blocks);
}
EXPORT_SYMBOL(sha256_update);
static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_words)
static void __sha256_final(struct sha256_state *sctx, u8 *out, int digest_size)
{
__be32 *dst = (__be32 *)out;
__be64 bits;
unsigned int index, pad_len;
int i;
static const u8 padding[64] = { 0x80, };
/* Save number of bits */
bits = cpu_to_be64(sctx->count << 3);
/* Pad out to 56 mod 64. */
index = sctx->count & 0x3f;
pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
sha256_update(sctx, padding, pad_len);
/* Append length (before padding) */
sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
/* Store state in digest */
for (i = 0; i < digest_words; i++)
put_unaligned_be32(sctx->state[i], &dst[i]);
/* Zeroize sensitive information. */
memzero_explicit(sctx, sizeof(*sctx));
lib_sha256_base_do_finalize(sctx, sha256_transform_blocks);
lib_sha256_base_finish(sctx, out, digest_size);
}
void sha256_final(struct sha256_state *sctx, u8 *out)
{
__sha256_final(sctx, out, 8);
__sha256_final(sctx, out, 32);
}
EXPORT_SYMBOL(sha256_final);
void sha224_final(struct sha256_state *sctx, u8 *out)
{
__sha256_final(sctx, out, 7);
__sha256_final(sctx, out, 28);
}
EXPORT_SYMBOL(sha224_final);